From my rear deck I noticed a fairly large light, similar to a landing light on a large aircraft, traveling rather slowly from the Northeast. My deck faces North. As it passed by overhead there was no noise. The light was solid. As it travelled Southwest the light remained constant. If it had been a landing light it would have disappeared as the "nose" was heading away from me. I am at 3,500 msl, and it appeared to be between 5,000 and 6,000 msl. Just before I lost sight it appeared to be emitting very tiny sparks which seemed to swarm around the object. My observation of the sparks was very brief, just a few seconds.